It seems to me from the latest email
We just rolled out the customer role to your organization Tecolote. This is a dedicated product access role that you can assign to users from admin.atlassian.com. Users with this role can only access your help center to submit support requests. We don’t charge for this, so it won’t affect the cost of your subscription.
Are you saying that you can add customers and you don't get billed for them like a regular user?